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Principles of Consolidation and Nature of Operations (Narrative) (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
a
segment
Dec. 31, 2023
USD ($)
a
Long-term Purchase Commitment [Line Items]      
Number of operating segments | segment   3  
Long-lived asset impairment charge   $ 0 $ 65,887
Business interruption insurance recoveries   13,612 0
Acquisitions of mineral and royalty interests   $ 713 $ 36,714
Gross acres | a   13,700 43,400
Net royalty acres | a   600 2,500
Gross acres of mineral and royalty interest | a   198,400  
Net royalty acres of mineral and royalty interest | a   63,900  
Assets held for sale   $ 14,159 $ 6,466
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]     Other Nonoperating Income (Expense)
HLCP      
Long-term Purchase Commitment [Line Items]      
Post-closing purchase price adjustment     $ 3,600
Pension Plan      
Long-term Purchase Commitment [Line Items]      
Settlements   0 1,815
Minerals Management      
Long-term Purchase Commitment [Line Items]      
Sale of land $ 7,000    
Gain in the minerals management segment $ 4,500    
Eiger, LLC      
Long-term Purchase Commitment [Line Items]      
Equity method investment in Eiger, LLC   19,147 $ 2,800
Income from equity method investee   600  
Eiger, LLC | Minerals Management      
Long-term Purchase Commitment [Line Items]      
Equity method investment in Eiger, LLC   19,100  
Eiger, LLC | Fourth Quarter 2024 Investment in Oil and Natural Gas Interests      
Long-term Purchase Commitment [Line Items]      
Equity method investment in Eiger, LLC   $ 15,700